Question

A pump takes suction from a propane tank whose fluid level is 30
inches above the pump inlet centerline. The propane specific
gravity is .48, the atmospheric pressure is 14.32 psia, the
sunction line energy loss is .73 feet and the propane vapor
pressure head is 1080 ft. Caculate the propane tank pressure
required to provide a minimum of 4 feet NPSH at the pump suction.
Give answer as a gage pressure in psig.